Module: Code0::ZeroTrack::Database::MigrationHelpers::TablePartitioning

Included in:
Code0::ZeroTrack::Database::Migration::V1_0
Defined in:
lib/code0/zero_track/database/migration_helpers/table_partitioning.rb

Instance Method Summary collapse

Instance Method Details

#create_dynamic_partition_schema ⇒ Object 



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# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 28

def create_dynamic_partition_schema
  schema = quote_table_name(Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema)
  execute "CREATE SCHEMA #{schema}"
end

#create_partition_by_date_table(table_name, partition_column:, **options, &block) ⇒ Object 



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# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 8

def create_partition_by_date_table(table_name, partition_column:, **options, &block)
  options[:options] = "PARTITION BY RANGE (#{quote_column_name(partition_column)})"
  options[:id] = false

  create_table(table_name, **options) do |t|
    t.bigserial :id, null: false

    block.call(t)
  end

  reversible do |dir|
    dir.up do
      execute <<~SQL.squish
        ALTER TABLE #{quote_table_name(table_name)}
        ADD PRIMARY KEY (#{quote_column_name(:id)}, #{quote_column_name(partition_column)})
      SQL
    end
  end
end

#create_partitioning_views ⇒ Object 



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# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 38

def create_partitioning_views
  dynamic_schema = Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_partitioned_tables AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           CASE p.partstrat
             WHEN 'l' THEN 'list'
             WHEN 'r' THEN 'range'
             WHEN 'h' THEN 'hash'
           END AS strategy,
           pg_get_partkeydef(c.oid) AS partition_key
    FROM pg_partitioned_table p
    JOIN pg_class c ON c.oid = p.partrelid
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE n.nspname = current_schema();
  SQL

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_partitions AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           i.inhparent::regclass::text AS parent_identifier,
           pg_get_expr(c.relpartbound, c.oid) AS condition,
           obj_description(c.oid) AS comment,
           i.inhrelid IS NOT NULL AS attached
    FROM pg_class c
    LEFT JOIN pg_inherits i ON c.oid = i.inhrelid
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relispartition
      AND c.relkind = 'r'
      AND n.nspname IN (current_schema(), #{quote(dynamic_schema)});
  SQL

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_detached_partitions AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           obj_description(c.oid)::jsonb ->> 'table' AS parent_identifier,
           (obj_description(c.oid)::jsonb ->> 'detached_at')::timestamptz AS detached_at
    FROM pg_class c
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relkind = 'r'
      AND n.nspname = #{quote(dynamic_schema)}
      AND NOT EXISTS (
        SELECT 1 FROM pg_inherits WHERE inhrelid = c.oid
      )
      AND obj_description(c.oid)::jsonb ? 'table'
      AND obj_description(c.oid)::jsonb ? 'detached_at';
  SQL
end

#drop_dynamic_partition_schema ⇒ Object 



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# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 33

def drop_dynamic_partition_schema
  schema = quote_table_name(Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema)
  execute "DROP SCHEMA #{schema}"
end

#drop_partitioning_views ⇒ Object 



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# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 97

def drop_partitioning_views
  execute 'DROP VIEW IF EXISTS postgres_detached_partitions'
  execute 'DROP VIEW IF EXISTS postgres_partitions'
  execute 'DROP VIEW IF EXISTS postgres_partitioned_tables'
end